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  <section id="cmake-generator-toolset">
<span id="variable:CMAKE_GENERATOR_TOOLSET"></span><h1>CMAKE_GENERATOR_TOOLSET<a class="headerlink" href="#cmake-generator-toolset" title="Permalink to this heading">¶</a></h1>
<p>Native build system toolset specification provided by user.</p>
<p>Some CMake generators support a toolset specification to tell the
native build system how to choose a compiler.  If the user specifies
a toolset (e.g. via the <a class="reference internal" href="../manual/cmake.1.html#cmdoption-cmake-T"><code class="xref std std-option docutils literal notranslate"><span class="pre">cmake</span> <span class="pre">-T</span></code></a> option or via
the <span class="target" id="index-0-envvar:CMAKE_GENERATOR_TOOLSET"></span><a class="reference internal" href="../envvar/CMAKE_GENERATOR_TOOLSET.html#envvar:CMAKE_GENERATOR_TOOLSET" title="CMAKE_GENERATOR_TOOLSET"><code class="xref cmake cmake-envvar docutils literal notranslate"><span class="pre">CMAKE_GENERATOR_TOOLSET</span></code></a> environment variable) the value
will be available in this variable.</p>
<p>The value of this variable should never be modified by project code.
A toolchain file specified by the <span class="target" id="index-0-variable:CMAKE_TOOLCHAIN_FILE"></span><a class="reference internal" href="CMAKE_TOOLCHAIN_FILE.html#variable:CMAKE_TOOLCHAIN_FILE" title="CMAKE_TOOLCHAIN_FILE"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_TOOLCHAIN_FILE</span></code></a>
variable may initialize <code class="docutils literal notranslate"><span class="pre">CMAKE_GENERATOR_TOOLSET</span></code>.  Once a given
build tree has been initialized with a particular value for this
variable, changing the value has undefined behavior.</p>
<p>Toolset specification is supported only on specific generators:</p>
<ul class="simple">
<li><p><a class="reference internal" href="../manual/cmake-generators.7.html#visual-studio-generators"><span class="std std-ref">Visual Studio Generators</span></a> for VS 2010 and above</p></li>
<li><p>The <span class="target" id="index-0-generator:Xcode"></span><a class="reference internal" href="../generator/Xcode.html#generator:Xcode" title="Xcode"><code class="xref cmake cmake-generator docutils literal notranslate"><span class="pre">Xcode</span></code></a> generator for Xcode 3.0 and above</p></li>
<li><p>The <span class="target" id="index-0-generator:Green Hills MULTI"></span><a class="reference internal" href="../generator/Green%20Hills%20MULTI.html#generator:Green Hills MULTI" title="Green Hills MULTI"><code class="xref cmake cmake-generator docutils literal notranslate"><span class="pre">Green</span> <span class="pre">Hills</span> <span class="pre">MULTI</span></code></a> generator</p></li>
</ul>
<p>See native build system documentation for allowed toolset names.</p>
<section id="visual-studio-toolset-selection">
<h2>Visual Studio Toolset Selection<a class="headerlink" href="#visual-studio-toolset-selection" title="Permalink to this heading">¶</a></h2>
<p>The <a class="reference internal" href="../manual/cmake-generators.7.html#visual-studio-generators"><span class="std std-ref">Visual Studio Generators</span></a> support toolset specification
using one of these forms:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">toolset</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">toolset[,key=value]*</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">key=value[,key=value]*</span></code></p></li>
</ul>
<p>The <code class="docutils literal notranslate"><span class="pre">toolset</span></code> specifies the toolset name.  The selected toolset name
is provided in the <span class="target" id="index-0-variable:CMAKE_VS_PLATFORM_TOOLSET"></span><a class="reference internal" href="CMAKE_VS_PLATFORM_TOOLSET.html#variable:CMAKE_VS_PLATFORM_TOOLSET" title="CMAKE_VS_PLATFORM_TOOLSET"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_VS_PLATFORM_TOOLSET</span></code></a> variable.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">key=value</span></code> pairs form a comma-separated list of options to
specify generator-specific details of the toolset selection.
Supported pairs are:</p>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">cuda=&lt;version&gt;|&lt;path&gt;</span></code></dt><dd><p>Specify the CUDA toolkit version to use or the path to a
standalone CUDA toolkit directory.  Supported by VS 2010
and above. The version can only be used with the CUDA
toolkit VS integration globally installed.
See the <span class="target" id="index-0-variable:CMAKE_VS_PLATFORM_TOOLSET_CUDA"></span><a class="reference internal" href="CMAKE_VS_PLATFORM_TOOLSET_CUDA.html#variable:CMAKE_VS_PLATFORM_TOOLSET_CUDA" title="CMAKE_VS_PLATFORM_TOOLSET_CUDA"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_VS_PLATFORM_TOOLSET_CUDA</span></code></a> and
<span class="target" id="index-0-variable:CMAKE_VS_PLATFORM_TOOLSET_CUDA_CUSTOM_DIR"></span><a class="reference internal" href="CMAKE_VS_PLATFORM_TOOLSET_CUDA_CUSTOM_DIR.html#variable:CMAKE_VS_PLATFORM_TOOLSET_CUDA_CUSTOM_DIR" title="CMAKE_VS_PLATFORM_TOOLSET_CUDA_CUSTOM_DIR"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_VS_PLATFORM_TOOLSET_CUDA_CUSTOM_DIR</span></code></a> variables.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">host=&lt;arch&gt;</span></code></dt><dd><p>Specify the host tools architecture as <code class="docutils literal notranslate"><span class="pre">x64</span></code> or <code class="docutils literal notranslate"><span class="pre">x86</span></code>.
Supported by VS 2013 and above.
See the <span class="target" id="index-0-variable:CMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE"></span><a class="reference internal" href="CMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE.html#variable:CMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE" title="CMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE</span></code></a>
variable.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">version=&lt;version&gt;</span></code></dt><dd><p>Specify the toolset version to use.  Supported by VS 2017
and above with the specified toolset installed.
See the <span class="target" id="index-0-variable:CMAKE_VS_PLATFORM_TOOLSET_VERSION"></span><a class="reference internal" href="CMAKE_VS_PLATFORM_TOOLSET_VERSION.html#variable:CMAKE_VS_PLATFORM_TOOLSET_VERSION" title="CMAKE_VS_PLATFORM_TOOLSET_VERSION"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_VS_PLATFORM_TOOLSET_VERSION</span></code></a> variable.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">VCTargetsPath=&lt;path&gt;</span></code></dt><dd><p>Specify an alternative <code class="docutils literal notranslate"><span class="pre">VCTargetsPath</span></code> value for Visual Studio
project files.  This allows use of VS platform extension configuration
files (<code class="docutils literal notranslate"><span class="pre">.props</span></code> and <code class="docutils literal notranslate"><span class="pre">.targets</span></code>) that are not installed with VS.</p>
</dd>
</dl>
</section>
<section id="visual-studio-toolset-customization">
<h2>Visual Studio Toolset Customization<a class="headerlink" href="#visual-studio-toolset-customization" title="Permalink to this heading">¶</a></h2>
<p><strong>These are unstable interfaces with no compatibility guarantees</strong>
because they hook into undocumented internal CMake implementation details.
Institutions may use these to internally maintain support for non-public
Visual Studio platforms and toolsets, but must accept responsibility to
make updates as changes are made to CMake.</p>
<p>Additional <code class="docutils literal notranslate"><span class="pre">key=value</span></code> pairs are available:</p>
<dl>
<dt><code class="docutils literal notranslate"><span class="pre">customFlagTableDir=&lt;path&gt;</span></code></dt><dd><div class="versionadded">
<p><span class="versionmodified added">New in version 3.21.</span></p>
</div>
<p>Specify the absolute path to a directory from which to load custom
flag tables stored as JSON documents with file names of the form
<code class="docutils literal notranslate"><span class="pre">&lt;platform&gt;_&lt;toolset&gt;_&lt;tool&gt;.json</span></code> or <code class="docutils literal notranslate"><span class="pre">&lt;platform&gt;_&lt;tool&gt;.json</span></code>,
where <code class="docutils literal notranslate"><span class="pre">&lt;platform&gt;</span></code> is the <span class="target" id="index-0-variable:CMAKE_VS_PLATFORM_NAME"></span><a class="reference internal" href="CMAKE_VS_PLATFORM_NAME.html#variable:CMAKE_VS_PLATFORM_NAME" title="CMAKE_VS_PLATFORM_NAME"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_VS_PLATFORM_NAME</span></code></a>,
<code class="docutils literal notranslate"><span class="pre">&lt;toolset&gt;</span></code> is the <span class="target" id="index-1-variable:CMAKE_VS_PLATFORM_TOOLSET"></span><a class="reference internal" href="CMAKE_VS_PLATFORM_TOOLSET.html#variable:CMAKE_VS_PLATFORM_TOOLSET" title="CMAKE_VS_PLATFORM_TOOLSET"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_VS_PLATFORM_TOOLSET</span></code></a>,
and <code class="docutils literal notranslate"><span class="pre">&lt;tool&gt;</span></code> is the tool for which the flag table is meant.
<strong>This naming pattern is an internal CMake implementation detail.</strong>
The <code class="docutils literal notranslate"><span class="pre">&lt;tool&gt;</span></code> names are undocumented.  The format of the <code class="docutils literal notranslate"><span class="pre">.json</span></code>
flag table files is undocumented.</p>
</dd>
</dl>
</section>
</section>


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<li><a class="reference internal" href="#">CMAKE_GENERATOR_TOOLSET</a><ul>
<li><a class="reference internal" href="#visual-studio-toolset-selection">Visual Studio Toolset Selection</a></li>
<li><a class="reference internal" href="#visual-studio-toolset-customization">Visual Studio Toolset Customization</a></li>
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